期刊文献+
共找到255,023篇文章
< 1 2 250 >
每页显示 20 50 100
Everything Is a Circle: A New Universal Orbital Model
1
作者 Asli Pinar Tan 《Advances in Aerospace Science and Technology》 2024年第3期94-116,共23页
Based on measured astronomical position data of heavenly objects in the Solar System and other planetary systems, all bodies in space seem to move in some kind of elliptical motion with respect to each other. Accordin... Based on measured astronomical position data of heavenly objects in the Solar System and other planetary systems, all bodies in space seem to move in some kind of elliptical motion with respect to each other. According to Kepler’s 1st Law, “orbit of a planet with respect to the Sun is an ellipse, with the Sun at one of the two foci.” Orbit of the Moon with respect to Earth is also distinctly elliptical, but this ellipse has a varying eccentricity as the Moon comes closer to and goes farther away from the Earth in a harmonic style along a full cycle of this ellipse. In this paper, our research results are summarized, where it is first mathematically shown that the “distance between points around any two different circles in three-dimensional space” is equivalent to the “distance of points around a vector ellipse to another fixed or moving point, as in two-dimensional space”. What is done is equivalent to showing that bodies moving on two different circular orbits in space vector-wise behave as if moving on an elliptical path with respect to each other, and virtually seeing each other as positioned at an instantaneously stationary point in space on their relative ecliptic plane, whether they are moving with the same angular velocity, or different but fixed angular velocities, or even with different and changing angular velocities with respect to their own centers of revolution. This mathematical revelation has the potential to lead to far reaching discoveries in physics, enabling more insight into forces of nature, with a formulation of a new fundamental model regarding the motions of bodies in the Universe, including the Sun, Planets, and Satellites in the Solar System and elsewhere, as well as at particle and subatomic level. Based on the demonstrated mathematical analysis, as they exhibit almost fixed elliptic orbits relative to one another over time, the assertion is made that the Sun, the Earth, and the Moon must each be revolving in their individual circular orbits of revolution in space. With this expectation, individual orbital parameters of the Sun, the Earth, and the Moon are calculated based on observed Earth to Sun and Earth to Moon distance data, also using analytical methods developed as part of this research to an approximation. This calculation and analysis process have revealed additional results aligned with observation, and this also supports our assertion that the Sun, the Earth, and the Moon must actually be revolving in individual circular orbits. 展开更多
关键词 Solar System Planetary System PLANET Satellite Earth MOON Topology circle Sun ELLIPSE ORBIT TRAJECTORY Orbital Mechanics
下载PDF
Circle社交网络系统衍生的社区互助模式探究
2
作者 黄浩 张华 《工业工程设计》 2024年第4期100-106,共7页
探究Circle社区网络系统衍生的社区互助模式并总结传统设计与协同创新设计对于协同设计者的职能要求。从多元主体、理念衍生与模式思辨三个层次梳理Circle服务系统流程及利益相关者,剖析Circle社区网络系统的设计模式。基于此,文章从行... 探究Circle社区网络系统衍生的社区互助模式并总结传统设计与协同创新设计对于协同设计者的职能要求。从多元主体、理念衍生与模式思辨三个层次梳理Circle服务系统流程及利益相关者,剖析Circle社区网络系统的设计模式。基于此,文章从行为认同、情感互动及体验价值三个层面建构了社区协同互助模式的设计策略,并进一步扩展出协同设计者的四条职能:思辨设计思维、跨学科知识体系、能级导向设计及协调创新。Circle社交网络系统衍生的社区协同互助模式在一定程度上能够引导和优化本土化社区的弹性和韧性,朝着更加有利于社会创新模式的方向不断发展。 展开更多
关键词 协同设计 社区互助模式 circle 协同设计者职能
下载PDF
基于Circle映射和自适应t分布变异改进的鹈鹕优化算法
3
作者 高猛 曾宪文 《计算机与现代化》 2024年第9期69-73,共5页
针对传统鹈鹕优化算法(POA)存在收敛速度慢、易陷入局部最优解等缺陷,提出一种基于Circle映射初始化和自适应t分布变异的改进的鹈鹕优化算法(IPOA)。首先,在种群初始化阶段,采用Circle映射生成具有高度多样性的初始解,并结合反向学习策... 针对传统鹈鹕优化算法(POA)存在收敛速度慢、易陷入局部最优解等缺陷,提出一种基于Circle映射初始化和自适应t分布变异的改进的鹈鹕优化算法(IPOA)。首先,在种群初始化阶段,采用Circle映射生成具有高度多样性的初始解,并结合反向学习策略,提高种群多样性,增强种群的探索能力。其次,在迭代过程中,采用自适应t分布变异操作对个体进行扰动,有助于鹈鹕优化算法跳出局部最优解并提高收敛速度。另外,在鹈鹕优化算法的探索阶段引入自适应因子和改进惯性权重,更好地平衡算法全局探索能力和局部开发能力。最后,在多个测试函数上将IPOA与其他4种经典算法进行比较。实验结果表明,IPOA在收敛速度、全局搜索能力和收敛鲁棒性方面均有显著提升。 展开更多
关键词 鹈鹕优化算法 circle映射 自适应因子 自适应t分布变异
下载PDF
Comprehensive evaluation and spatial-temporal evolution characteristics of urban resilience in Chengdu-Chongqing Economic Circle
4
作者 Xin Li Shuyi Zhang +1 位作者 Rongxi Ren Yafei Wang 《Chinese Journal of Population,Resources and Environment》 2024年第1期58-67,共10页
To clarify the connotations and extensions of urban resilience,this study focuses on the Chengdu-Chongqing Economic Circle with 16 cities as research subjects.A comprehensive evaluation index system was constructed to... To clarify the connotations and extensions of urban resilience,this study focuses on the Chengdu-Chongqing Economic Circle with 16 cities as research subjects.A comprehensive evaluation index system was constructed to measure the resilience of each city from 2003 to 2020.The spatial-temporal evolution characteristics were analyzed using Kernel density estimation,standard deviation ellipse,and spatial Markov chain analysis,and the spatial Tobit model was introduced to discover the influencing factors.The results indicate the following:①Urban resilience in the Chengdu-Chongqing Economic Circle displays an upward trend,with the center of gravity moving to the southwest,and the polarization phenomenon intensifying.②The urban resilience level in a region has certain spatial and geographical dependence,while the probability of urban resilience transfer differs in adjacent cities with different resilience levels.③Urban centrality,economic scale,openness level,and financial development promote urban resilience,whereas government scale significantly inhibits it.Finally,this paper proposes countermeasures and suggestions to improve the urban resilience of the Chengdu-Chongqing Economic Circle. 展开更多
关键词 Chengdu-chongqing Economic circle Urban resilience Spatial-temporal evolution Driving factor
下载PDF
Research on the Evolution Structure of Fragment Disordering Public Opinion in College Students’ Network Circle Group
5
作者 Huawei Zhi Yan Qiao 《Social Networking》 2024年第4期45-65,共21页
Clarifying the evolution structure of public opinion induced and spread by fragmentation in college students’ network circle group is the key to understanding college students’ online social psychological demands, g... Clarifying the evolution structure of public opinion induced and spread by fragmentation in college students’ network circle group is the key to understanding college students’ online social psychological demands, grasping the development trend of public opinion, and designing targeted public opinion governance strategies. On the basis of identifying the key variables in the process of public opinion communication, DEMATEL-ISM model is used to explore the attribute positioning, relative importance level and hierarchical association mechanism of ante-variable and result variable, and then the governance strategies for fragment disordering public opinion in network circle groups of college students is designed. According to the study, exogenous stimuli, the uniqueness of discourse system, the number of spectacular texts and micro-narrative mode constituted the deep-rooted causes of fragment disordering public opinion. The unique situational and information attributes of network circle groups often become an important “booster” of disordered public opinion. The topic deviation is often accompanied with the formation of negative emotions. The corresponding public opinion governance strategies are sought from the aspects of shaping the network environment, adjusting the operation mechanism of the network circle group, improving the efficiency of using fragmented information, and optimizing the human resources of colleges. 展开更多
关键词 College Students’ Network circle Group Fragment Disordering Public Opinion Governance DEMATEL ISM
下载PDF
The Impact of Digital Finance on High-Quality Development of the Chengdu-Chongqing Economic Circle
6
作者 Wei Liangyi Bai Xiaobo Li Qin 《Contemporary Social Sciences》 2024年第2期1-15,共15页
This paper developed a comprehensive evaluation system that was able to quantify the levels of high-quality development across the cities within the Chengdu-Chongqing economic circle,and investigate the impact that di... This paper developed a comprehensive evaluation system that was able to quantify the levels of high-quality development across the cities within the Chengdu-Chongqing economic circle,and investigate the impact that digital finance had on the cities’high-quality development and the underlying mechanisms through which it achieved this.This comprehensive evaluation system was constructed using statistical data from these cities for the period 2014 to 2020 while also taking China’s high-quality development philosophy into account.The key findings revealed that:(a)Digital finance was able to significantly promote high-quality development in the Chengdu-Chongqing economic circle;(b)Digital finance had a significant positive effect in promoting innovative,coordinated,green,open,and shared development;(c)Digital finance was able to stimulate the high-quality development in the Chengdu-Chongqing economic circle by boosting entrepreneurial dynamism;(d)Digital finance had a significant impact on the high-quality development of the axis areas,while its impact was less discernible in non-axis areas.The insights from this research offer a deeper understanding of the factors that drive high-quality development,the role digital finance plays,and the mechanisms through which digital finance is able to propel high-quality development at the city cluster scale. 展开更多
关键词 digital finance Chengdu-Chongqing economic circle high-quality development
下载PDF
Coupling coordinated development among digital economy,regional innovation,and talent employment:A case study in the Hangzhou Metropolitan Circle,China
7
作者 QIU Luyi Sharina OSMAN HUA Yidi 《Regional Sustainability》 2024年第1期93-106,共14页
Coordinative development across various systems,particularly the economic,social,cultural,and human resources subsystems,is a key aspect of urban sustainability and has a direct impact on the quality of urbanization.T... Coordinative development across various systems,particularly the economic,social,cultural,and human resources subsystems,is a key aspect of urban sustainability and has a direct impact on the quality of urbanization.The Hangzhou Metropolitan Circle,comprising Hangzhou City,Huzhou City,Jiaxing City,and Shaoxing City,was the first metropolitan circle approved by the National Development and Reform Commission(NDRC)as a demonstration of economic transformation in China.To evaluate the coupling coordination degree of the four cities and analyze the coordinative development in three systems(including digital economy,regional innovation,and talent employment),we collected panel data during 2015–2022 from these four cities.The development level of the three systems was evaluated by the standard deviation method and comprehensive development index.The results are as follows:(1)the level of coupling coordinated development of the three systems in the Hangzhou Metropolitan Circle was relatively low;(2)the coupling coordination degree of the four cities in the Hangzhou Metropolitan Circle showed significant regional differences,among which Hangzhou City was in the leading position,and Huzhou,Jiaxing,and Shaoxing cities made steady but slow progress in the coupling development of the three systems;and(3)the development of digital economy and talent employment needs to be strengthened.This study contributes to the coordinative development of Hangzhou Metropolitan Circle by innovatively focusing on the coupling coordination relationship among digital economy,regional innovation,and talent employment,which also meets the industrial layout of Hangzhou Metropolitan Circle.In this way,the optimal allocation and sustainable development of digital economy,regional innovation,and talent employment in the Hangzhou Metropolitan Circle can be achieved. 展开更多
关键词 Digital economy Regional innovation Talent employment Coupling coordination degree Hangzhou Metropolitan circle
下载PDF
Enhancing Women's Well-being and Self-Confidence through Fragrance Cosmetics:Perceptions within Close and Broader Social Circles
8
作者 Yang Fan Guo Miao +1 位作者 Zhou Ziyan Abriat Anne 《China Detergent & Cosmetics》 CAS 2024年第2期69-78,共10页
Mental and physical stress can affect people's self-confidence and happiness.The primary objective of this study is to develop an active fragrance that has been proved to have a positive effect on happiness and se... Mental and physical stress can affect people's self-confidence and happiness.The primary objective of this study is to develop an active fragrance that has been proved to have a positive effect on happiness and self-confidence based on the latest research results of aroma components and fragrance innovation.The active fragrance is applied to the cream formula to study the emotions it brings to the user and extend the research scope of the active emotion to the close and extensive social circle of users to see whether it can perceive it.This study provides a reference cosmetic solution for emotional regulating active fragrance. 展开更多
关键词 FRAGRANCE emotion CREAM social circle
下载PDF
Identification and Optimisation of Cycling Life Circle in High Density Communities with Public Health Support: A Case Study of Tiantongyuan in Beijing
9
作者 LIANG Weinan HUANG Yi +1 位作者 WANG Zilin ZHOU Xuan 《Journal of Landscape Research》 2024年第5期27-32,37,共7页
In recent years,the compact development of high-density cities has sparked ongoing interest in healthy urban environments and public well-being.This study examines the relationship between cycling behaviors and the bu... In recent years,the compact development of high-density cities has sparked ongoing interest in healthy urban environments and public well-being.This study examines the relationship between cycling behaviors and the built environment of streets in Tiantongyuan Community,a typical high-density area in Beijing,China.By observing street spaces and summarizing residents’travel modes and behaviors,the study evaluates the impact of street design on cycling habits.In order to reveal the riding behavior characteristics of residents in different time periods and different street spaces,tools such as track recording APPs and the Gopro Motion Camera are employed to collect street view pictures and riding track data comprehensively,analyzing the various travel purposes of residents in Tiantongyuan community and the riding OD activity tracks of the main entrances and exits of the community.Meanwhile,by conducting the questionnaire survey of residents’travel demands and OD data of Baidu,and utilizing geographic information system(GIS)for data visualization,this study further investigates the distribution characteristics of cycling hotspots,cycling paths and cycling space,accurately identifies the cycling life circle of this community based on the spatial and temporal scales,and further puts forward the optimization strategy of the cycling network.Some cycling-friendly street space optimization strategies are suggested to deeply analyze the mechanism of the built environment of street space in high-density communities on the cycling activities and health of urban residents,with a view to provide accurate data support for the renewal of street cycling space. 展开更多
关键词 Public health High-density neighbourhoods Cycling life circle Precision update Tiantongyuan community
下载PDF
Spatial Distribution Characteristics and Coverage Rate of Commercial Facilities in 15-minute Radius Livelihood Service Circles of Chunshu Street
10
作者 HAN Qiqi YANG Kaitai 《Journal of Landscape Research》 2024年第1期17-21,共5页
Building a 15-minute radius livelihood service circle from the needs of residents is a topdown process of optimizing urban layout and promoting high-quality development implemented by the government.In September 2022,... Building a 15-minute radius livelihood service circle from the needs of residents is a topdown process of optimizing urban layout and promoting high-quality development implemented by the government.In September 2022,Xicheng District of Beijing served as a national pilot of the 15-minute radius livelihood service circle.Based on the data of POI,urban walking network and building outline,this paper studies the coverage of commercial service facilities in the 15-minute radius livelihood service circle of Chunshu Street by using kernel density analysis and urban network analysis tools.The research shows that the commercial facilities are concentrated in Zhuangsheng Square and Dazhalan commercial district.There are large gaps in housekeeping and couriers logistics facilities,which need to be further improved. 展开更多
关键词 Chunshu Street 15-minute radius livelihood service circle POI Historic urban areas Community business
下载PDF
Progress of International Meridian Circle Program
11
作者 WANG Chi BLANC Michel +13 位作者 ZHANG Shunrong DENARDINI Clezio Marcos LIU William SHEN Xuhui WU Jian XU Jiyao LI Hui ZHANG Qinghe REN Liwen ZHU Yajun LI Guozhu DING Zonghua LIU Zhengkuan YANG Fang 《空间科学学报》 CAS CSCD 北大核心 2024年第4期741-745,共5页
In 2024,the Chinese Meridian Project(CMP)completed its construction,deploying 282 instruments across 31 stations.This achievement not only provides a robust foundation but also serves as a reference template for the I... In 2024,the Chinese Meridian Project(CMP)completed its construction,deploying 282 instruments across 31 stations.This achievement not only provides a robust foundation but also serves as a reference template for the International Meridian Circle Program(IMCP).The IMCP aims to integrate and establish a comprehensive network of ground-based monitoring stations designed to track the propagation of space weather events from the Sun to Earth.Additionally,it monitors various disturbances generated within the Earth system that impact geospace.Over the past two years,significant progress has been made on the IMCP.In particular,the second phase of construction for the China-Brazil Joint Laboratory for Space Weather has been completed,and the North Pole and Southeast Asia networks are under active construction.The 2024 IMCP joint observation campaign was successfully conducted.To facilitate these developments,the scientific program committee of IMCP was established,following the success of 2023 IMCP workshop and the space weather school,which was co-hosted with the Asia-Pacific Space Cooperation Organization(APSCO)and sponsored by Chinese Academy of Sciences(CAS)and Scientific Committee on Solar-Terrestrial Physics(SCOSTEP).Preparations are now underway for the 2024 workshop in collaboration with the National Institute for Space Research(INPE)in Brazil. 展开更多
关键词 Chinese Meridian Project(CMP) International Meridian circle Program(IMCP) China-Brazil Joint Laboratory for Space Weather North Pole and Southeast Asia networks
下载PDF
Research on the Application of Evidence-Based Quality Control Circle to Improve the Implementation Rate of Airway Management Measures in Adult Critically Ill Patients
12
作者 Yujiao Yan Jing Wu +4 位作者 Juan Liu Yanting Yuan Lixin Liu Huaxin Ye Juan Ding 《Yangtze Medicine》 2024年第1期8-19,共12页
Objective: To explore the effect of evidence-based quality control circle (QCC) in improving the implementation rate of airway management measures in adult critically ill patients. Methods: Based on the Joanna Briggs ... Objective: To explore the effect of evidence-based quality control circle (QCC) in improving the implementation rate of airway management measures in adult critically ill patients. Methods: Based on the Joanna Briggs Institute (JBI) evidence-based health care model, the best evidence of airway management in adult critically ill patients was obtained and applied to the clinic. Results: The total implementation rate of airway management measures in adult critically ill patients increased from 23.62% before the implementation of quality control circle to 88.82%, and the pulmonary infection rate in critically ill patients decreased from 42.31% to 21.74%, with statistical significance between the two groups (P 0.05). Conclusion: Evidence-based quality control circle activities can standardize the practice standards of airway management in critically ill patients, reduce the occurrence of patients’ airway related complications, and improve clinical outcomes. 展开更多
关键词 Critically Ill Patients Airway Management Be Evidence-Based Quality Control circle Intensive Care Unit (ICU)
下载PDF
Construction of a New Model of Contactless Medical Services for Outpatients Based on the Project-Achieving Quality Control Circle 被引量:2
13
作者 Shuang Chen Zhihong Gao +1 位作者 Xiaoxia Huang Zhiqin Yin 《Journal of Clinical and Nursing Research》 2023年第4期29-37,共9页
Objective: To carry out empirical research on the role of project-achieving quality control circle (QCC) in constructing a new model of contactless medical service for outpatients. Methods: A QCC, consisting of inform... Objective: To carry out empirical research on the role of project-achieving quality control circle (QCC) in constructing a new model of contactless medical service for outpatients. Methods: A QCC, consisting of information office members from a grade A tertiary hospital in Wenzhou, was established to conduct a research project with the theme “Constructing a new model of contactless medical service based on outpatients’ experience.” According to the ten steps and PDCA cycle, an analysis was carried out before and after the QCC activities, focusing on improving pre-consultation services, providing steward-like services, and facilitating post-consultation management. Results: After the QCC activities, the mobile appointment rate, missed appointment rate, the proportion of smart check-ins, and the average check-in time were 55.68%, 4.02%, 39.75%, and 8.24 ± 3.66 min, respectively;in contrast, before the activities, they were 32.00%, 7.88%, 0.00%, and 14.96 ± 4.98 min, respectively;the difference between the two groups was statistically significant (χ2 = 3480.112, 4994.496;Fisher’s exact probability = 963788.570;t = 5.323, P < 0.001). Many experts have also visited the hospital to learn about this system, thus rendering social and economic benefits. Conclusion: Project-achieving QCC activities are suitable for complex situations, such as constructing a new model of contactless medical service, and can significantly improve outpatient service quality, enhance patients’ experience, and improve the abilities of circle members. 展开更多
关键词 Quality control circle Project-achieving Outpatient Contactless medical service Patient experience
下载PDF
Research on Sports Public Service Supply in the Chengdu-Chongqing Twin-City Economic Circle under the Background of Regional Economic Development
14
作者 Yiming Yang Yun Liu Yu Huang 《Proceedings of Business and Economic Studies》 2024年第2期106-113,共8页
Using literature,questionnaires,interviews,and mathematical statistics to investigate the current situation of sports public services in the Chengdu-Chongqing Twin-city Economic Circle.The results show that there are ... Using literature,questionnaires,interviews,and mathematical statistics to investigate the current situation of sports public services in the Chengdu-Chongqing Twin-city Economic Circle.The results show that there are some problems in Chengdu-Chongqing sports public services,such as big difference in the development level of supply between urban and rural areas,low supply level,low efficiency,supply mechanism defect,lack of social sports instructors,an outstanding contradiction between the quality of sports public service and residents’demand.To address the problems,government departments should accelerate the transformation of government functions,improve the relevant regulations and systems,increase the investment in sports public services,improve the quality of supply,cultivate the backbone team,integrate resources,and combine the national characteristics with regional characteristics,take into account the personalized needs of the residents,combine the sports public services with intelligence,and build the service system of“Internet+Fitness.” 展开更多
关键词 Regional economy Chengdu-Chongqing Twin-city Economic circle Sports demand Sports public service Current supply situation
下载PDF
引入Circle映射和正弦余弦因子的改进粒子群算法 被引量:6
15
作者 徐福强 邹德旋 +2 位作者 李灿 罗鸿赟 章猛 《计算机工程与应用》 CSCD 北大核心 2023年第17期80-90,共11页
针对粒子群算法在搜索寻优过程中存在收敛速度慢、精度低和易陷入局部最优等问题,提出了引入Circle映射和正弦余弦因子的改进粒子群算法。采用引入Circle映射的种群初始化操作,能获得更加均匀和多样的初始种群,有利于提高算法的收敛速... 针对粒子群算法在搜索寻优过程中存在收敛速度慢、精度低和易陷入局部最优等问题,提出了引入Circle映射和正弦余弦因子的改进粒子群算法。采用引入Circle映射的种群初始化操作,能获得更加均匀和多样的初始种群,有利于提高算法的收敛速度和精度。采用非线性递减的惯性权重并引入正弦余弦算法中的正弦余弦因子的策略,更好地平衡了算法全局探索能力和局部开发能力。受鲸鱼优化算法启发,提出并采用带有淘汰制的随机搜索策略,增强了算法跳出局部最优和全局探索的能力。在16个基准测试函数上对该算法进行了仿真实验,并与4种粒子群相关算法及其他4种群智能优化算法进行了比较和分析,验证了所提出的改进算法具有更强的收敛性能和稳定性。 展开更多
关键词 粒子群优化算法 circle映射 正弦余弦因子 随机搜索策略 正弦余弦算法 鲸鱼优化算法
下载PDF
嵌入Circle映射的混合策略多目标粒子群算法 被引量:1
16
作者 张娴子 刘衍民 +1 位作者 刘君 陈飞 《遵义师范学院学报》 2023年第4期89-95,共7页
多目标粒子群算法具有收敛速度快、原理简单和易于实现等优点,被广泛应用于解决多目标优化问题。然而,它存在容易过早收敛、陷入局部最优等缺点。针对上述问题,提出了一种嵌入Circle映射的混合策略多目标粒子群算法(CMEMOPSO)。当粒子... 多目标粒子群算法具有收敛速度快、原理简单和易于实现等优点,被广泛应用于解决多目标优化问题。然而,它存在容易过早收敛、陷入局部最优等缺点。针对上述问题,提出了一种嵌入Circle映射的混合策略多目标粒子群算法(CMEMOPSO)。当粒子当前位置与其个体历史最优位置互不支配时,在一定概率下,利用Circle映射调整粒子位置,使其找到更优的解。同时,若外部存档达到预定阈值,则使用结合个体密度和拐点距离的混合评价指标评估非劣解的综合性能,去除较差的非劣解以实现对外部存档的更新,提高算法的综合性能。最后,利用所提出的算法在12个典型测试函数上进行实验。实验结果表明CMEMOPSO具有良好的收敛性和更快的收敛速度,它在大多数测试函数上优于其他比较算法。 展开更多
关键词 circle映射 个体密度 拐点距离 多目标优化 粒子群算法
下载PDF
基于主客观环流分型的强降水数值预报MODE检验方法及其在2019年暖季东北地区的应用
17
作者 齐铎 崔晓鹏 +4 位作者 陈力强 黄丽君 刘松涛 卜文惠 王承伟 《大气科学》 CSCD 北大核心 2024年第3期1113-1130,共18页
本文构建了基于主客观环流分型的强降水数值预报空间检验(MODE)方法框架,并利用该框架对欧洲中期天气预报中心全球模式(ECMWF)和中国气象局区域中尺度数值天气预报模式(CMA_MESO)的2019年暖季东北地区强降水预报进行检验。结果表明,201... 本文构建了基于主客观环流分型的强降水数值预报空间检验(MODE)方法框架,并利用该框架对欧洲中期天气预报中心全球模式(ECMWF)和中国气象局区域中尺度数值天气预报模式(CMA_MESO)的2019年暖季东北地区强降水预报进行检验。结果表明,2019年暖季东北地区54个强降水日的环流型可分为:西风槽型(15个)、副热带高压影响型(13个)、急流型(5个)、西部(12个)和东部冷涡型(9个)。其中,西风槽型和急流型以区域性强降水为主,模式对其强降水发生与否的预报能力强,TS评分较高;西部、东部冷涡型强降水的局地性强,模式对其强降水发生与否的预报能力差,TS评分低;副热带高压影响型也以区域性强降水为主,模式对其强降水发生与否的预报能力也比较强,但是对其强降水质心位置、强度、面积等属性预报偏差较大,TS评分也相对较低。另外,从两种模式预报性能对比看,CMA_MESO强降水强度和面积预报较实况普遍偏强,虽然其预报的TS评分一般高于ECMWF,但其对强降水预报的空报率也都比ECMWF大,对强降水的属性预报偏差一致性一般也低于ECMWF,其预报的可订正性整体上不及ECMWF。 展开更多
关键词 主客观融合环流分型 东北冷涡客观识别 强降水 数值预报 mode检验
下载PDF
On the Reconstruction of Teachers’Role of Business English Reading Classroom Teaching Based on Literature Circle 被引量:1
18
作者 HU Lijun 《Sino-US English Teaching》 2023年第3期90-96,共7页
Business English reading teaching under the mode of“literature circles”focuses on cultivating students’autonomy in reading,group cooperation,and the exchange of ideas among group members.In this teaching mode,teach... Business English reading teaching under the mode of“literature circles”focuses on cultivating students’autonomy in reading,group cooperation,and the exchange of ideas among group members.In this teaching mode,teachers are no longer the masters of the reading classroom,but the helpers,participants,and researchers in the process of students’reading.The reconstruction of teachers’role can promote the benign development of relationship not only between teachers and students,but also between students and students,inject new impetus and vitality into the classroom,and improve students’reading literacy. 展开更多
关键词 business English reading literature circles teacher’s role RECONSTRUCTION
下载PDF
Application effect of quality control circle in postoperative functional exercise compliance of breast neoplasms patients:a meta-analysis 被引量:1
19
作者 Shu Wu Wen-Jia Gao +2 位作者 Lan Li Xiao-Hui Li Li-Juan Sun 《Nursing Communications》 2023年第19期1-7,共7页
Background:Good adherence to post-operative exercise is crucial for long-term exercise intervention programs aimed at improving compliance,motivation for functional exercise,and quality of life among breast cancer pat... Background:Good adherence to post-operative exercise is crucial for long-term exercise intervention programs aimed at improving compliance,motivation for functional exercise,and quality of life among breast cancer patients.This study aims to evaluate the application effect of quality control circles on postoperative functional exercise compliance in breast neoplasm patients.Methods:A comprehensive search was conducted in CNKI,Wanfang,VIP,CBM,PubMed,Cochrane Library,Web of Science and CINAHL databases from their establishment to May 06,2023.Manual search and backtracking of relevant literature were also conducted.The search terms included a combination of subject terms and free words.Meta-analysis was performed using RevMan 5.4 software on eligible literature.Results:Initially,517 papers were retrieved,and after removing duplicates 238 papers using NoteExpress software,279 titles and abstracts were reviewed.Subsequently,225 non-compliant papers were excluded,leaving 54 full texts to be read.After excluding 38 non-compliant papers,16 eligible papers were included for Meta-analysis.These papers comprised a total of 1,342 patients(679 in the test group and 663 in the control group).The heterogeneity test using a fixed effects model showed P=0.22 and I2=21%.The Meta-analysis results demonstrated that the implementation of quality control circles alongside usual care significantly improved compliance with postoperative functional exercise in breast cancer patients(odds ratio=6.68,95%confidence interval(4.97,8.98),P<0.00001).Conclusion:Quality control circles activities can effectively enhance compliance with post-operative functional exercise among breast cancer patients,aiding in the recovery of affected limb function,improvement of self-care ability,and early reintegration into society and normal life,thereby enhancing quality of life.It is important to continually accumulate experience in applying relevant quality control circles activities in clinical work and promptly enhance the level of care accordingly,as the functional exercise of breast cancer patients after surgery involves a long-term and gradual improvement process. 展开更多
关键词 quality control circle breast cancer postoperative functional exercise compliance META-ANALYSIS
下载PDF
一种基于粗糙熵的改进K-modes聚类算法
20
作者 刘财辉 曾雄 谢德华 《南京理工大学学报》 CAS CSCD 北大核心 2024年第3期335-341,共7页
K-modes聚类算法被广泛应用于人工智能、数据挖掘等领域。传统的K-modes聚类算法有不错的聚类效果,但是存在迭代次数多、计算量大、容易受到冗余属性的干扰等问题,且仅采用简单的0-1匹配的方法来定义2个样本属性值之间的距离,没有充分... K-modes聚类算法被广泛应用于人工智能、数据挖掘等领域。传统的K-modes聚类算法有不错的聚类效果,但是存在迭代次数多、计算量大、容易受到冗余属性的干扰等问题,且仅采用简单的0-1匹配的方法来定义2个样本属性值之间的距离,没有充分考虑每个属性对聚类结果的影响。针对上述问题,该文将粗糙熵引入K-modes算法。首先利用粗糙集属性约简算法消除冗余属性,确定各属性的重要程度;然后利用粗糙熵确定每个属性的权重,从而定义新的类内距离。将该文所提算法与传统的K-modes聚类算法分别在4组公开数据集上进行对比试验。试验结果表明,该文所提算法聚类准确率比传统的K-modes聚类算法更高。 展开更多
关键词 聚类 K-modes算法 粗糙集 粗糙熵 属性约简 权重
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部